(19)
(11) EP 2 264 201 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
12.01.2011 Bulletin 2011/02

(43) Date of publication A2:
22.12.2010 Bulletin 2010/51

(21) Application number: 10075341.7

(22) Date of filing: 16.12.2005
(51) International Patent Classification (IPC): 
C22C 29/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 16.12.2004 US 13842

(62) Application number of the earlier application in accordance with Art. 76 EPC:
05257765.7 / 1686193

(71) Applicant: TDY Industries, Inc.
Pittsburgh, PA 15222-5479 (US)

(72) Inventors:
  • Mirchandani, Prakash K.
    Hampton Cove Alabama 35763 (US)
  • Mosco, Alfred J.
    Spring Texas 77379 (US)

(74) Representative: Powell, Timothy John et al
Potter Clarkson LLP Park View House 58 The Ropewalk
Nottingham NG1 5DD
Nottingham NG1 5DD (GB)

   


(54) Methods of preparing cemented carbide inserts for earth-boring bits


(57) The invention relates to methods of preparing cutting inserts for earth-boring bits. In one embodiment the method comprises partially filling a mould with a first cemented hard particle powder, filling at least a portion of the remaining portion of the mould with a second cemented hard particle powder, consolidating the first and second cemented hard particle powders into a single green compact and sintering the single green compact. In a further embodiment the method comprises consolidating a first cemented carbide powder in a mould to provide a first green compact, placing the first green compact in a second mould, wherein the first green compact fills a portion of the second mould, filling at least a portion of a remaining portion of the second mould with a second cemented carbide powder, consolidating the second cemented carbide powder and the first green compact together to form a second green compact and sintering the second green compact.







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